In spite of being an ageing device, Galaxy Nexus is among the lucky few Android devices to enjoy stock-like Lollipop features with AOSP ROM, as Google is unlikely to support or release Android 5.0 update on these devices.

The new AOSP ROM brings pure stock-like Android experience to Galaxy Nexus in a stable release that can be used as a daily driver.

Step 4 - Power off the phone and disconnect its USB cable from computer

Step 5 - Now boot the device into bootloader/fastboot Mode by pressing and holding Volume Up, Volume Down and Power buttons together. Tap Volume Down until the Start option at the top changes to Recovery mode and then hit Power button to reboot into Recovery mode.

Step 6 - Once the phone enters into CWM Recovery, perform a full data wipe task by clicking Wipe Data/Factory Reset. Use the Volume keys to navigate between options and Power button to select an option in the Recovery Mode

Step 8 - Now perform Wipe Dalvik Cache as well. To do this, go to 'advanced' option and then click Wipe Dalvik Cache. This will help in preventing boot loop issues or any boot ROM related errors duringfirmware installation

Step 9 - Then return to the main recovery menu and choose InstallZip from SDcard

Step 10 - Now click Choose Zip from SDcard. Use volume keys to navigate to the AOSP ROM zip file that you copied earlier to your phone's SD card and choose it by tapping the Power button. Confirm the ROM installation on next screen and the installation process will begin